Normal-relaxor ferroelectric modulation of a-site complex perovskite ferroelectric (K1/2Bi1/2)TiO3 by post-annealing

2017 ◽  
Vol 121 (1) ◽  
pp. 014101 ◽  
Author(s):  
Jinjian Guo ◽  
Mankang Zhu ◽  
Ling Li ◽  
Tianhe Qing ◽  
Cong Wang ◽  
...  
Keyword(s):  
Relaxor Ferroelectric ◽  
Complex Perovskite ◽  
Post Annealing ◽  
A Site

Effect of bond valence on microwave dielectric properties of (Pb1−xCax)(Mg0.33Ta0.67)O3 ceramics

2001 ◽  
Vol 16 (3) ◽  
pp. 817-821 ◽  
Author(s):  
Heung Soo Park ◽  
Ki Hyun Yoon ◽  
Eung Soo Kim
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Bond Valence ◽  
Negative Deviation ◽  
Complex Perovskite ◽  
Microwave Frequencies ◽  
Microwave Dielectric ◽  
Dielectric Polarizability ◽  
A Site ◽  
The Relationship

The relationship between the dielectric properties of the complex perovskite (Pb1−xCax)(Mg0.33Ta0.67)O3 ceramics, where 0.45 ≤ × ≤ 0.60, and the dielectric polarizability, related to bond valences of A-site ions, was investigated at microwave frequencies. As the Ca content (x) increased, the deviation of the observed dielectric polarizabilities, calculated by the Clausius–Mosotti equation from the theoretical values calculated by the additivity rule of dielectric polarizability, decreased from −3% to −0.69%. It was found that this deviation was related to the bond valence of the A-site. Smaller negative deviation corresponded to the cations with lower bond valence, and larger negative deviation corresponded to the cations with higher bond valence. Also, the temperature coefficient of resonant frequency (TCF) was affected by the bond valence of the A-site, and then TCF decreased with decreasing bond valence of the A-site in ABO3 perovskite compounds.

Raman spectroscopy of CaTiO3-based perovskite solid solutions

2004 ◽  
Vol 19 (2) ◽  
pp. 488-495 ◽  
Author(s):  
H. Zheng ◽  
I.M. Reaney ◽  
G.D.C. Csete de Györgyfalva ◽  
R. Ubic ◽  
J. Yarwood ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid Solutions ◽  
Dielectric Resonators ◽  
Complex Perovskite ◽  
Microwave Dielectric ◽  
Ion Radius ◽  
A Site ◽  
End Members

Perovskite-structured solid solutions intended for use as microwave dielectric resonators were studied by Raman spectroscopy. Two distinct categories were investigated: (i) simple perovskite–simple perovskite solid solutions, that is, CaTiO3–SrTiO3 (CTST), CaTiO3–CaZrO3 (CTCZ), CaTiO3–NdAlO3 (CTNA), and CaTiO3–LaGaO3 (CTLG); and (ii) simple perovskite–complex perovskite solid solutions, such as CaTiO3–SrMg1/3Nb2/3O3 (CTSMN). In the latter category, the influence of A-site ion radius was also addressed by examining 0.5CaTiO3– 0.5LaMg1/2Ti1/2O3 (0.5CT–0.5LMT), 0.5SrTiO3 (ST)–0.5LMT, and 0.5BaTiO3 (BT)–0.5LMT. Raman data from the end members and solid solutions are compared, paying particular attention to F2g and A1g mode bands, often associated with ordering of B-site species.

Monte Carlo simulation of domains and mesoscopic structures in complex perovskite relaxor ferroelectric pb(mg1/3nb2/3)o3

2001 ◽  
Vol 252 (1) ◽  
pp. 163-170
Author(s):  
J. S. Liu ◽  
Z. R. Liu ◽  
H. Zheng ◽  
J. Ni ◽  
B. L. Gu ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Relaxor Ferroelectric ◽  
Complex Perovskite

Ferrimagnetic and relaxor ferroelectric properties of R2MnMn(MnTi3)O12 perovskites with R = Nd, Eu, and Gd

2021 ◽  
Author(s):  
Ran Liu ◽  
Masahiko Tanaka ◽  
Hiromu Mori ◽  
Yoshiyuki Inaguma ◽  
Kazunari Yamaura ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Relaxor Ferroelectric ◽  
A Site

A-site columnar-ordered quadruple perovskites R2MnMn(MnTi3)O12 (R = Nd, Eu, Gd) exhibit relaxor-like ferroelectric properties and ferrimagnetic transitions with large moments.

Topochemical Synthesis of Perovskite-type CuNb2O6 with Colossal Dielectric Constant

2021 ◽  
Author(s):  
Masayuki Fukuda ◽  
Ikuya Yamada ◽  
Hajime Hojo ◽  
Chihiro Takahashi ◽  
Yuya Yoshida ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Pressure ◽  
Structural Transformation ◽  
High Pressure Synthesis ◽  
Synthesis Techniques ◽  
Post Annealing ◽  
Pressure Synthesis ◽  
Colossal Dielectric Constant ◽  
A Site ◽  
Perovskite Type

A novel A-site deficient quadruple perovskite (Pv) oxide, CuNb2O6, has been successfully obtained by a combination of high-pressure synthesis techniques and topochemical structural transformation. Post-annealing of a high-pressure-synthesized Pv-CuNbO3 above...

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